Vocke V21 single-stage semi-hermetic screw refrigeration series — Zhejiang Vocke Refrigeration (Jinhua)

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Product overview

Vocke V21 single-stage semi-hermetic screw refrigeration series from Zhejiang Vocke Refrigeration (Jinhua)

V21 is Vocke's single-stage screw refrigeration route, with a V21–V22 series image in the original catalogue. Its semi-hermetic screw architecture is identified in the English product range. The number 21 does not denote a two-stage compressor: the maker's nomenclature assigns K/N to single-stage temperature types and S to a separate two-stage low-temperature route.

V21K140-50 is listed with displacement 140/168 m³/h at 50/60 Hz, maximum current 79 A, maximum power 50 kW and weight 238 kg. V21N140-40 shares the displacement entry but lists 65 A maximum current, 40 kW maximum power and weight 234 kg. K denotes high-temperature single-stage duty and N low-temperature single-stage duty. Use the complete suffix to request performance and electrical selection.

The shared table specifies three-phase 380–420 V/50 Hz or 440–480 V/60 Hz and delta/double-delta notation. Published discharge/suction connection entries are 42/54 mm. Confirm the actual winding, starter/controller, valves, mounting and piping drawing; displacement, maximum electrical ratings and motor horsepower in the nomenclature represent different quantities.

Published features include motor protection, a PTC discharge-temperature sensor, an internal discharge check valve and an external-economizer route. Determine what is supplied with the compressor and what is part of the refrigeration-system design: oil separator/return, economizer, injection and capacity-control arrangement, sensors and controller. Request connection and control diagrams tied to the exact offered model.

Give the supplier refrigerant, refrigeration load, evaporating and condensing temperatures, superheat, subcooling, frequency and load profile. Compare refrigeration capacity, input and operating envelope at the same conditions, including economizer assumptions. Published m³/h is displacement rather than cooling kW; neither 50 kW maximum electrical power nor the model's horsepower suffix establishes useful refrigeration output. Agree site/destination requirements, testing, commissioning and service parts in the order scope.

Catalog reference	VOCKE-V21
Machine	Refrigeration
Power	—
Working pressure	—
Published flow	—
Air quality	—
Duty	Cold chain
Supply	Not specified
Plant	Zhejiang Vocke Refrigeration (Jinhua)
Architecture	Single-stage semi-hermetic screw refrigeration
Named models	V21K140-50 (K high-temperature); V21N140-40 (N low-temperature)
Displacement 50/60 Hz	140/168 m³/h; not refrigeration capacity
V21K140-50	Maximum current 79 A; maximum power 50 kW; 238 kg
V21N140-40	Maximum current 65 A; maximum power 40 kW; 234 kg
Electrical reference	380–420 V/3/50 Hz; 440–480 V/3/60 Hz
Connection record	Discharge 42 mm; suction 54 mm
Scope	Current selection, protection, oil circuit, economizer and controller to agree